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Brett M
Guest
I have a 2000 Chevrolet K2500 with a 4L80E transmission and there is a problem with the shifting. When Im driving highway speeds and my truck faces some resistance (i.e, hills, stiff wind), the truck will downshift and not shift up again. All of the other gears will shift just fine except overdrive. Then, when I shut the truck off for a couple minutes, and restart it, its almost as though nothing happened, shifting just fine. I have done valve bottle work using a TransGo kit, replaced the front and rear speed sensors and still nothing. My next guess is torque converter. The truck used to have a 5th wheel behind it and that is my reason for guessing torque converter. The lead tech at our local dealership suggested a replacement transmission but, thats $3200 so, anyone have any suggestions or ideas?